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Revenue from Contracts with Customers (Tables)
 3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenues The following tables provide further disaggregation of our revenues by categories we use to evaluate our financial performance within each of our reportable segments (in thousands):
 
For the three months ended March 31, 2019
 
% of
Total
 
For the three months ended March 31, 2018
 
% of
Total
United States electrical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
269,441

 
51
%
 
$
184,382

 
40
%
Institutional market sector
22,345

 
4
%
 
28,008

 
6
%
Hospitality market sector
6,841

 
1
%
 
5,516

 
1
%
Manufacturing market sector
98,803

 
19
%
 
85,794

 
19
%
Healthcare market sector
17,615

 
3
%
 
38,507

 
8
%
Transportation market sector
58,139

 
11
%
 
71,264

 
16
%
Water and wastewater market sector
6,015

 
1
%
 
4,613

 
1
%
Short duration projects (1)
40,409

 
8
%
 
29,530

 
7
%
Service work
9,262

 
2
%
 
8,168

 
2
%
 
528,870

 

 
455,782

 
 
Less intersegment revenues
(800
)
 


 
(1,030
)
 
 
Total segment revenues
$
528,070

 

 
$
454,752

 
 
United States mechanical construction and facilities services:
 
 
 
 
 
 
 
Commercial market sector
$
281,862

 
37
%
 
$
230,799

 
33
%
Institutional market sector
61,283

 
8
%
 
64,655

 
9
%
Hospitality market sector
13,648

 
2
%
 
26,527

 
4
%
Manufacturing market sector
98,763

 
13
%
 
92,214

 
13
%
Healthcare market sector
61,374

 
8
%
 
65,876

 
10
%
Transportation market sector
5,734

 
1
%
 
5,206

 
1
%
Water and wastewater market sector
43,211

 
6
%
 
36,751

 
5
%
Short duration projects (1)
99,936

 
13
%
 
79,722

 
12
%
Service work
89,466

 
12
%
 
86,225

 
13
%
 
755,277

 

 
687,975

 
 
Less intersegment revenues
(2,868
)
 


 
(3,225
)
 
 
Total segment revenues
$
752,409

 

 
$
684,750

 
 
 ________
(1)
Represents those projects which generally are completed within three months or less.




 
For the three months ended March 31, 2019
 
% of
Total
 
For the three months ended March 31, 2018
 
% of
Total
United States building services:
 
 
 
 
 
 
 
Commercial site-based services
$
155,978

 
30
%
 
$
146,761

 
32
%
Government site-based services
48,791

 
10
%
 
55,409

 
12
%
Mechanical services
274,166

 
54
%
 
227,342

 
50
%
Energy services
33,144

 
6
%
 
25,240

 
6
%
Total segment revenues
$
512,079

 

 
$
454,752

 
 
United States industrial services:
 
 

 
 
 
 
Field services
$
216,770

 
84
%
 
$
162,187

 
81
%
Shop services
41,875

 
16
%
 
37,057

 
19
%
Total segment revenues
$
258,645

 

 
$
199,244

 
 
 
 
 
 
 
 
 
 
Total United States operations
$
2,051,203

 
 
 
$
1,793,498

 
 
United Kingdom building services:
 
 
 
 
 
 
 
Service work
$
54,634

 
51
%
 
$
55,275

 
52
%
Projects & extras
52,891

 
49
%
 
51,615

 
48
%
Total segment revenues
$
107,525

 

 
$
106,890

 
 
 
 
 

 
 
 
 
Total worldwide operations
$
2,158,728

 

 
$
1,900,388

 
 
Contract Assets and Contract Liabilities Net contract liabilities consisted of the following (in thousands):
 
March 31, 2019
 
December 31, 2018
Contract assets, current
$
178,366

 
$
158,243

Contract assets, non-current
—

 
—

Contract liabilities, current
(536,363
)
 
(552,290
)
Contract liabilities, non-current
(2,119
)
 
(2,069
)
Net contract liabilities
$
(360,116
)
 
$
(396,116
)
Remaining Performance Obligations The following table presents the transaction price allocated to remaining unsatisfied performance obligations (“remaining performance obligations”) for each of our reportable segments and their respective percentages of total remaining performance obligations (in thousands, except for percentages):
 
March 31, 2019
 
% of Total
Remaining performance obligations:
 
 
 
United States electrical construction and facilities services
$
1,125,052

 
27
%
United States mechanical construction and facilities services
2,256,936

 
54
%
United States building services
544,618

 
13
%
United States industrial services
78,861

 
2
%
Total United States operations
4,005,467

 
96
%
United Kingdom building services
151,124

 
4
%
Total worldwide operations
$
4,156,591

 
100
%
Remaining Performance Obligations, Expected Timing of Satisfaction Refer to the table below for additional information regarding our remaining performance obligations, including an estimate of when we expect to recognize such remaining performance obligations as revenue (in thousands):
 
Within one year
 
Greater than one year
Remaining performance obligations:
 
 
 
United States electrical construction and facilities services
$
1,027,849

 
$
97,203

United States mechanical construction and facilities services
1,793,969

 
462,967

United States building services
535,198

 
9,420

United States industrial services
78,861

 
—

Total United States operations
3,435,877

 
569,590

United Kingdom building services
99,405

 
51,719

Total worldwide operations
$
3,535,282

 
$
621,309